How many letters does the top answer for “director of knocked up” have?

The most common answer is apatow (6 letters).

Crossword clue: director of knocked up

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

apatow 6 letters wd-fact-v3

director of the round-up 50% similar → jancso

director of up in the air 50% similar → clooney, kendrick